Thanks for reaching out to us! I believe you are referring to replacing photos on Flickr. Normally there is an option to replace or save as new just above the save button when saving to Flickr. If however you don’t see this option, please try signing out of Flickr (from the PHOTOS > Flickr tab in Ribbet, by clicking Log Out on the left bar) and then connecting again.
If you then continue to have this issue then please reach out to us by emailing support [at] ribbet.com and we’ll look into this further.
Regards – The Ribbet Team